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Last change
on this file since 1538 was 2, checked in by Yuri Dario, 15 years ago |
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Initial import for vendor code.
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-
Property svn:eol-style
set to
native
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File size:
793 bytes
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| 1 | # Copyright 2006 Google, Inc. All Rights Reserved.
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| 2 | # Licensed to PSF under a Contributor Agreement.
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| 3 |
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| 4 | # A grammar to describe tree matching patterns.
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| 5 | # Not shown here:
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| 6 | # - 'TOKEN' stands for any token (leaf node)
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| 7 | # - 'any' stands for any node (leaf or interior)
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| 8 | # With 'any' we can still specify the sub-structure.
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| 9 |
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| 10 | # The start symbol is 'Matcher'.
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| 11 |
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| 12 | Matcher: Alternatives ENDMARKER
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| 13 |
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| 14 | Alternatives: Alternative ('|' Alternative)*
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| 15 |
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| 16 | Alternative: (Unit | NegatedUnit)+
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| 17 |
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| 18 | Unit: [NAME '='] ( STRING [Repeater]
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| 19 | | NAME [Details] [Repeater]
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| 20 | | '(' Alternatives ')' [Repeater]
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| 21 | | '[' Alternatives ']'
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| 22 | )
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| 23 |
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| 24 | NegatedUnit: 'not' (STRING | NAME [Details] | '(' Alternatives ')')
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| 25 |
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| 26 | Repeater: '*' | '+' | '{' NUMBER [',' NUMBER] '}'
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| 27 |
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| 28 | Details: '<' Alternatives '>'
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